Java Spring Boot Expert for FinTech

@vladang

Building payment-grade Spring Boot services usually starts with understanding the transaction flows before touching architecture. I’d begin by mapping core payment states, then define a clean PostgreSQL schema with Liquibase so changes stay controlled from day one. On top of that, I’d expose REST APIs with Spring Boot and OpenAPI, keeping request bodies strict but flexible where JSON fields evolve. Once the core flow is stable, I’d introduce Kafka for event propagation like payment status changes and use RabbitMQ for lighter async work such as notifications or reconciliation. Redis would handle caching for read-heavy endpoints to keep latency predictable under load. The risky part in systems like this is always duplicates and partial failures, so I’d design idempotent endpoints and retry-safe consumers early, backed by integration tests and JMeter checks before scaling. I’ve worked on similar contract backend systems where missing idempotency caused subtle financial bugs, so I tend to enforce it upfront.

@ashokdzpxq

Hi , I would like to apply for the opportunity to contribute to your project. With 18+ years of experience as a Java Spring Developer, I bring a proven track record of designing, developing, and architecting scalable solutions for diverse industries, including fintech, e-commerce, and enterprise software. 2. Years of experience with Java and Spring Boot - java - 18 yrs and Spring boot 10 yrs 3. Relevant microservices projects completed 4 4. Experience with Kafka and RabbitMQ - 2 yrs 5. Hourly or monthly rate -- Hourly rate - 22 $/hr 6. Availability to start -- For parttime - available now and for full time available after 1 month notice

@C0RETECHIES

Hello, This aligns closely with the type of backend systems where scalability, event-driven communication, and operational reliability matter as much as feature delivery. The combination of Spring Boot microservices, PostgreSQL, Redis, Kafka, RabbitMQ, and payment-domain workflows requires careful attention to resilience, observability, and performance. Our experience includes backend platforms involving distributed services, REST APIs, asynchronous processing, payment-enabled workflows, authentication systems, database optimization, and large-scale integrations. We are comfortable contributing to established microservice ecosystems, implementing new services, optimizing existing ones, and supporting production environments. Particularly interested in the messaging and integration aspects of the platform, including Kafka/RabbitMQ workflows, API security, caching strategies, and performance optimization across distributed services. Best, Raksha

@Herculesz

Hi I can help develop and enhance your Java Spring Boot fintech/payment microservices platform using Java 17+, Spring Boot, Spring Data JPA, REST APIs, OpenAPI/Swagger, PostgreSQL, Redis, Liquibase, RabbitMQ, Kafka, Docker, and CI/CD pipelines. The main technical challenge is building resilient payment services that handle transactions, events, JSON payloads, retries, caching, database consistency, and API security without creating production risk. My approach is to deliver focused microservices work with clean architecture, secure endpoints, optimized PostgreSQL queries, Redis usage, event-driven integrations, and clear Swagger documentation. I have strong experience with Java, Spring Boot, microservices, REST API development, integration testing, JUnit, Cucumber-style test flows, and production troubleshooting. I can also work on Kafka/RabbitMQ consumers and producers, Liquibase migrations, JsonNode processing, performance testing with JMeter, and Docker-based deployment workflows. For FinTech and payments work, I pay close attention to authentication, authorization, idempotency, audit logs, error handling, and reliable transaction states. I can work independently, communicate clearly with architects and stakeholders, and submit clean PRs with test coverage and practical technical notes. Thanks, Hercules

@offshore9006

Hi There: Hope this note finds you in great spirits. Please note the below details: Summary: Technical Architect with 08 years of experience in product development in JAVA, Hibernate, JPA, Spring, Java FX, SQL, performance tuning and web application security with a knack for troubleshooting. SKILLS: Java 1.7, 1.8: Hibernate JPA | Spring Boot, Spring cloud Jboss JBPM, JBoss Drools Quartz scheduler | Oracle |PostgreSQL | Java performance analysis Oracle WebLogic | Apache Tomcat Apache Solr | Elastic stack Apache ActiveMQ | AWS Lambd | Eclipse, IntelliJ |Stanford CoreNLP Architecture: Microservices | Monolithic We are a team of IT professionals mentored by very experienced leadership. We offer solutions on WEB and Mobile technologies. Please visit our company site www.kennedia.net. We have in-house UI/UX and a Testing team. We will start the work within 2-3 days after the award of the project. Per hour rate: US$20/hr Look forward to hearing from you!! Thanks, Raman

@Muhammadzeesha59

Hello Sir/MAM I am a skilled full stack developer. Having rich experience in Java , C++ , C , C# , Python , Eclipse , Sql , Mysql , .Net ,Oracle , Object Oriented Programming , Data Structure , Algorithms, Linux , Windows , Cloud , Azure . I have a perfect grip on “Artificial Intelligence” “Automation” , and work in “Machine Learning” Deep Learning ”. My track record as demonstrated in my 100% job completion and 5-star review rating showcases My ability to deliver exceptional results on time and with utmost quality I believe that my skill set makes me the ideal candidate for this project Please come on chat we will discuss more about this I will be waiting for your reply . Thanks and Best Regards

@skalogir

Hi there, I understand you need a Senior Java Spring Boot developer to design and enhance cloud-native FinTech microservices, implement REST and event-driven integrations, optimize PostgreSQL/Redis performance, and maintain reliable Kafka and RabbitMQ messaging within a production-grade payments platform. I have extensive experience with Java, Spring Boot, Spring Data JPA, PostgreSQL, Redis, Liquibase, Kafka, RabbitMQ, Docker, CI/CD pipelines, distributed systems, API security, performance optimization, and building scalable microservices for high-availability business-critical applications. I would contribute by designing resilient services, implementing secure APIs and messaging workflows, improving database and cache efficiency, strengthening test coverage with JUnit/Cucumber, supporting performance testing, and helping drive architecture and code quality across the platform. Q1: How many microservices are currently in production, and what is the overall system scale? Q2: Is the platform hosted on AWS, Azure, GCP, or a private cloud environment? Q3: What are the highest-priority initiatives: new feature development, platform modernization, performance optimization, or production support? Best regards, Stratos

@pashyaa

Hi, I am interested in this Java Spring Boot FinTech/Payments platform role. I have 12+ years of Java development experience with strong hands-on work in Spring Boot, REST APIs, Spring Data JPA, PostgreSQL, microservices, Docker, CI/CD, Swagger/OpenAPI, JSON processing, JUnit, production troubleshooting, and performance optimization. I have worked on enterprise backend systems involving integrations, audit/compliance workflows, PostgreSQL optimization, asynchronous processing, and production-safe releases. I also have Kafka-based integration experience and can work with RabbitMQ-based patterns as required. I am available to start immediately. Please get in touch to discuss the project further, and I can share my updated CV/resume and relevant experience details. Thanks & Regards, Prasanna

@mickeysz

I understand that you are seeking a Senior Java Spring Boot Developer to contribute to a cloud-native FinTech and Payments platform, with a strong focus on microservices, event-driven architecture, scalability, reliability, and production-grade delivery. Based on my experience, successful payment platforms depend heavily on resilient microservices, secure API design, efficient messaging infrastructure, and well-optimized data layers. Without proper architectural decisions around Kafka, RabbitMQ, PostgreSQL, Redis, and service communication, systems often face scalability bottlenecks, operational complexity, and production stability issues. Compared to traditional monolithic financial systems, modern Spring Boot microservices combined with event-driven integrations provide greater flexibility, fault isolation, and deployment independence. This architecture is particularly valuable in FinTech environments where transaction reliability, performance, and rapid feature delivery are critical. My plan is to review the existing architecture and requirements, design and implement scalable Spring Boot microservices, optimize database and cache usage, build reliable event-driven integrations, strengthen API security, develop automated test coverage, participate in code reviews, and support production readiness through performance optimization and troubleshooting. Thank you.

@anirudhat

Your stack is exactly what I work with daily — Java 17, Spring Boot microservices, PostgreSQL with Redis caching, and event-driven messaging via Kafka and RabbitMQ in production FinTech environments. I've built payment processing pipelines where resilience and data consistency are non-negotiable, handling idempotent transaction flows, distributed saga patterns, and API security with OAuth2/JWT across microservice boundaries. My workflow fits your need for independence: I pick up complex requirements, design the service with proper Liquibase migrations and OpenAPI contracts first, implement with thorough JUnit and Cucumber coverage, and deliver production-grade code that passes integration and JMeter performance gates before it hits your CI/CD pipeline. I'm comfortable troubleshooting live production issues under pressure — that's just part of working in payments. Available to start immediately.

@belotefreelancer

"I have gone through your description. "This is my area of specialization, i can get it done 100 % perfectly well. Please ping me in person. I can help you to complete all tasks. I have hands-on experience in this field. We have already done similar types of projects. Connect with us for more details. Rest assured your satisfaction is guaranteed." Looking forward to your response." Thank you for your time and I am confident that we will be a great fit for this project. Best,

@letswork92

I understand that you are looking for a seasoned Java Spring Boot Developer to enhance your FinTech and Payments platform. With over 12 years of experience, I have extensive expertise in designing and developing microservices architecture using Java 17+, Spring Boot, and PostgreSQL, which aligns perfectly with your project requirements. My previous projects involved implementing REST APIs and event-driven integrations, utilizing RabbitMQ and Apache Kafka for messaging, ensuring high availability and performance. Additionally, I have strong skills in CI/CD pipelines and Docker, which are essential for seamless deployment in cloud-native environments. I pride myself on my ability to troubleshoot production issues effectively while writing comprehensive automated tests using JUnit and Cucumber to maintain code quality. Could you share more about the specific challenges you've encountered with your current microservices setup? This would help me better understand how I can contribute to your team.

@demivision

Hi there, Thank you for sharing the detailed project overview and requirements. DemiVision LLC is an experienced team specializing in Java-based cloud-native solutions, particularly within the FinTech and Payments sectors. We are excited about the opportunity to contribute to your microservices platform and are confident in our ability to deliver robust, production-ready solutions that meet your business objectives. Our team brings over 5 years of hands-on experience in Java (Java 17+), Spring Boot, and the development of scalable, event-driven microservices architectures. We have successfully delivered multiple projects utilizing PostgreSQL, Redis, Liquibase for database management, and have extensive experience integrating both RabbitMQ and Apache Kafka for reliable messaging and event streaming. Our expertise also spans REST API development (with OpenAPI/Swagger), CI/CD pipelines, Docker containerization, and comprehensive automated testing using JUnit, Cucumber, and JMeter. We understand the critical importance of security, resilience, and performance in the FinTech domain. Our approach typically involves close collaboration with client stakeholders to clarify requirements, followed by iterative design, implementation, and rigorous testing. We prioritize clean code, effective documentation, and proactive troubleshooting to ensure a seamless transition from development to production. DemiVision LLC is equipped to work independently or as an extension of your team, maintaining transparent communication and agile delivery practices. We are ready to provide further details on our relevant projects, experience with Kafka and RabbitMQ, and our availability to begin immediately. Looking forward to the possibility of working together and contributing to your platform’s success.

@Friends4it

Hi, I've read your brief — an experienced Java Spring Boot developer on contract to develop and enhance a cloud-native microservices platform in the FinTech/payments space. This is squarely backend work we do at Global IT Vision (we run containerized Java/PHP services in production). My approach: - Clean Spring Boot microservices: well-structured REST APIs, DTO/validation, and service boundaries that scale. - FinTech-grade rigor: secure auth (OAuth2/JWT), idempotent money/transaction paths, audit logging, and thorough tests so balances never drift. - Cloud-native delivery: Dockerized services, config/secrets handling, and CI/CD; observability (logging/metrics/health probes). - Fits into your existing platform and standards, contributing per sprint. I've posted scope questions on the board. Could we do a quick call to confirm the services/stack and where you need me first? — Muhammad Idrees / Global IT Vision Pvt. Ltd

@Cumuc

Hello, nice to meet you. I can help you develop and enhance your cloud-native microservices platform in the FinTech and Payments domain so that you can deliver reliable, scalable, and secure solutions with minimal oversight. My focus will be on building resilient services that meet your complex business requirements efficiently. For this project, I will design and implement Spring Boot microservices using Java 17+, leveraging REST APIs and OpenAPI/Swagger for documentation. I will optimize PostgreSQL and Redis integrations, and set up messaging with RabbitMQ and Kafka, ensuring seamless event-driven communication. I will also write comprehensive unit, integration, and performance tests to maintain high quality and stability. One quick question before starting: Are there specific security standards or compliance requirements I should keep in mind while designing the APIs and services? I’m ready to begin immediately and will keep you updated with clear progress reports. If you'd like, we can discuss the project details and get started today. Thank you, Cuzmuc

@AZTURK1

Hi there, I will deliver production-grade Spring Boot microservices for your cloud-native FinTech payments platform, covering Java 17+, RESTful API design, event-driven messaging, and performance validation. - Deliver a Spring Boot service (Java 17) with Spring Data JPA, Liquibase migrations, PostgreSQL schema, Redis caching, JSON processing and OpenAPI/Swagger docs - Implement RabbitMQ and Kafka messaging flows, CI/CD with GitHub Actions, Docker images, JUnit/Cucumber integration tests and JMeter performance scripts - staged deployment with rollback plan Skills: ✅ Spring Boot ✅ PostgreSQL ✅ REST APIs ✅ Microservices Architecture ✅ API security ✅ Docker Certificates: ✅ Microsoft® Certified: MCSA | MCSE | MCT ✅ cPanel® & WHM Certified CWSA-2 Available to start immediately; Would you prefer a production-ready Spring Boot microservice with CI/CD and performance validation, or a smaller PoC first to validate integrations? , $650 in 3 days.

@toriquldev123

Hallo dear, Hello dear! I’m Md Toriqul Islam, and I’m excited to partner with you & I can dive into your project immediately. I’m a senior backend developer with 10+ years of experience building scalable enterprise applications, microservices, and cloud-based systems. I understand you need a Java Spring Boot developer for a FinTech payments platform involving microservices architecture, REST APIs, event-driven integrations, database optimization, security, testing, and production-grade development. My expertise includes Java 17+, Spring Boot, Spring Data JPA, PostgreSQL, Redis, Kafka, RabbitMQ, Docker, CI/CD, REST APIs, JUnit, and distributed system architecture. I have experience developing secure, high-performance backend solutions and can work independently with your team to deliver reliable features. I’m ready to start immediately and would be happy to discuss your requirements. Best regards, Md Toriqul Islam

@godesignpk

Hi, We would like to grab this opportunity and will work till you get 100% satisfied with our work. We are an expert team which have many years of experience on Java, J2EE, Amazon Web Services, PostgreSQL, RESTful, Microservices, Spring Boot, RabbitMQ Please come over chat and discuss your requirement in a detailed way. Regards

@devendrathakur12

Hello, I built many large scale Java Spring Boot microservices and FinTech platforms similar before and I would love if I get the chance to work on your project. I can contribute across Java 17, Spring Boot, PostgreSQL, Redis, Kafka, RabbitMQ, Liquibase, Docker, and CI/CD, building resilient APIs, event driven services, and production ready integrations with strong testing and performance optimization. I am comfortable working independently while collaborating closely with architects and product teams. One question I have is whether your microservices currently follow synchronous REST communication only, or do you already have a shared event contract strategy for Kafka and RabbitMQ to maintain schema compatibility across services? Can we connect over a chat to discuss more about the project? Best regards, Dev Singh